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Updated: Aug 8, 2026
In Vitro Assay to Evaluate the Impact of Immunoregulatory Pathways on HIV-specific CD4 T Cell Effector Function
Published on: October 16, 2013
In vitro combined effects of human interferons and interleukin-2 on natural cell-mediated cytotoxicity
M P Fuggetta1, A Aquino, R Pepponi
1Institute of Experimental Medicine, National Council of Research, Rome, Italy.
Insights
Cytokine treatment with Interleukin-2 (IL2) and interferons (IFNs) can enhance natural cell-mediated cytotoxicity (NCMC) in human cells. The effectiveness of this immune modulation is dependent on the treatment sequence, with IL2 followed by IFNs showing positive results.
Area of Science:
- Immunology
- Cell Biology
- Cytokine Therapy
Background:
- Natural cell-mediated cytotoxicity (NCMC) is crucial for immune surveillance.
- Cytokines like Interleukin-2 (IL2) and interferons (IFNs) are key regulators of immune responses.
- Understanding cytokine interactions is vital for developing immunotherapies.
Purpose of the Study:
- To investigate the in vitro modulation of NCMC in human mononuclear cells (MNC) using sequential cytokine treatments.
- To determine the effects of Interleukin-2 (IL2) and interferons (IFNs) on the cytolytic function of MNC.
- To explore the schedule-dependency of cytokine treatment on NCMC.
Main Methods:
- Human MNC from 16 healthy donors were treated sequentially with IL2 and IFNs in vitro.
- Cytotoxic activity, cell proliferation, and TAC antigen expression were measured.
- Different treatment sequences (IL2 then IFNs, or IFNs then IL2) were compared.
Main Results:
- Sequential treatment with IL2 followed by IFNs increased NCMC in some MNC preparations.
- Treatment with IFNs before IL2 did not enhance, and sometimes decreased, LAK activity.
- The effects of IFNs on NCMC did not correlate with cell proliferation or TAC antigen expression in the IFNs-IL2 sequence.
Conclusions:
- IFNs can significantly increase IL2-induced NCMC in human MNC in vitro.
- The enhancement of NCMC by cytokine combinations is highly schedule-dependent.
- These findings suggest potential preclinical bases for cytokine cascade therapies in clinical settings.
Abstract:
In vitro modulation of natural cell-mediated cytotoxicity (NCMC), following sequential treatment of human mononuclear cells (MNC) with cytokines was investigated. Recombinant Interleukin-2 (IL2) used in combination with interferons (IFNs) induced variable effects on the cytolytic function of different MNC preparations obtained from 16 healthy donors. When MNC were treated with IFNs on day 4, after IL2 induction of LAK cells, increase or no change in cytotoxic activity was found. On the other hand, either no change or decrease in LAK activity occurred when MNC were treated with IFNs on day 0 before exposure to IL2. In this case the effect of IFNs on NCMC did not correlate with their activity on cell proliferation or on TAC antigen expression. In conclusion the present study points out that the NCMC of MNC of healthy donors, subjected to IL2 treatment in vitro, can be significantly increased by IFNs. However this effect is largely schedule-dependent (i.e. detectable with IL2-IFNs but not with IFNs-IL2 sequence), and can be obtained in a relatively limited number of cases. Moreover it is suggested that these in vitro studies could provide preclinical bases for a rational approach to in vivo treatment with cytokine cascade in a clinical setting.
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